Pre-existing type 2 diabetes, in pregnancy, first trimester

This code signifies a pregnant patient with a pre-existing diagnosis of type 2 diabetes mellitus, specifically during the first trimester of her pregnancy. It indicates that the patient had established type 2 diabetes prior to conception, which is now complicating her current pregnancy.

Apply this code when documentation clearly states a pre-existing diagnosis of type 2 diabetes in a pregnant patient who is in her first trimester. This is appropriate for initial prenatal visits or any encounter during the first trimester where the pre-existing diabetes is being managed or monitored. Documentation should confirm the type of diabetes and the gestational age.

• Always confirm the type of diabetes (type 1 vs. type 2) and the trimester of pregnancy from the physician's documentation.
• Do not confuse with gestational diabetes (diabetes that develops during pregnancy) or pre-existing type 1 diabetes.
• Sequence this code as the principal diagnosis when the diabetes is the main reason for the encounter, or as a secondary diagnosis when it is a co-morbidity affecting the pregnancy.